0041343005796

GREAT STUFF

Model 345372

Internet #202023037

Store SKU #574958

16 oz. Fireblock Insulating Foam Sealant

$6.98 /each
  • Save money and time by using this fire code approved formula
  • Air-sealing and insulating saves up to 20% on home energy costs
  • 16 oz. Fireblock Insulating Foam Sealant

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Product Overview

GREAT STUFF Fireblock Insulating Foam Sealant can save much more than energy costs. By sealing the pipe, cable and duct penetrations, you minimize airflow. During a fire, that means flames, harmful gasses and toxic smoke cannot spread as quickly. And in an emergency, that could make all the difference. The fact that it helps you conserve energy, reduce drafts and save on heating and cooling costs is great too.

  • Impedes spread of fire and smoke through service penetrations
  • Recognized as an alternate fireblocking material for residential construction; tested according to ASTM E84, ASTM E814 (Modified), UL 1715
  • Seals service penetrations between floors and electrical runs through wall studs
  • Airtight, water-resistant and has exceptional adhesion to building materials
  • Tack free in 6 minutes; trims in 30 minutes; cures rigid in 8 hours
  • Bright orange colored foam for easy code identification
  • All-direction dispensing

    GREAT STUFF insulating foam

  • How much do you need? Let our calculator help:
    Insulation calculator button

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Customer Questions & Answers

31 Questions86 Answers

Customer Questions & Answers

16 oz. Fireblock Insulating Foam Sealant
16 oz. Fireblock Insulating Foam Sealant

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5 answers

can Great Stuff Fireblock be used for filling gaps between cabinets and stove vents?

This question is from 16 oz. Fireblock Insulating Foam Sealant
Asked by
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February 21, 2015
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Answers (5)

Asked by
Saint Johns, MI
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Home Improvement Profile: DIYer
July 30, 2015
Answer: 
I would.
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March 23, 2015
Answer: 
GREAT STUFF ™ Fireblock Insulating Foam Sealant is a minimal-expanding, single-component polyurethane foam for general purpose building envelope air sealing. It has led the way in the industry by being the first foam sealant to be recognized as a fireblock. Fireblocking is defined by the International Building Code as the use of approved building materials installed in concealed spaces to resist the Read More
GREAT STUFF ™ Fireblock Insulating Foam Sealant is a minimal-expanding, single-component polyurethane foam for general purpose building envelope air sealing. It has led the way in the industry by being the first foam sealant to be recognized as a fireblock. Fireblocking is defined by the International Building Code as the use of approved building materials installed in concealed spaces to resist the migration of fire and hot gases. GREAT STUFF Fireblock is tinted orange to be more recognizable to building code officials.
GREAT STUFF is not approved for use in firestop systems.
GREAT STUFF (TM) Insulating Foam Sealant products should not be used around heaters, furnaces, fireplaces, or recessed lighting fixtures where it contacts heat conducting surfaces. Cured foam is combustible and may present a fire hazard if exposed to flame or temperatures above 240F.
This product is flammable during dispensing. Do not smoke or use near open flame. Shut off pilot lights and sources of ignition until tack free.
Can contents are under pressure. Do not place in hot water. Do not puncture, incinerate or store at temperatures over 120F.
The contents of the GREAT STUFF (TM) should be as close to room temperature as possible when dispensed. The application temperature should be from 40°F to 120°F (5°C to 50°C). Read Less
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Home Improvement Profile: DIYer
February 23, 2015
Answer: 
no, you should use a fire-proof product around sources of flame and high-heat
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Asked by
Massachusetts
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Home Improvement Profile: DIYer
February 22, 2015
Answer: 
Dear Handylad:
Great question! Based on the "Fireblock" label, you would think that this version of DOW Great Stuff is fireproof or fire resistant. In fact, cured Great Stuff Fireblock foam ignites at just 240 degrees F -- significantly lower than the ignition point for wood studs! This is also true for retail poly foam products from other manufacturers, e.g. 3M "Fireblock Foam Sealant".
So, Great Read More
Dear Handylad:
Great question! Based on the "Fireblock" label, you would think that this version of DOW Great Stuff is fireproof or fire resistant. In fact, cured Great Stuff Fireblock foam ignites at just 240 degrees F -- significantly lower than the ignition point for wood studs! This is also true for retail poly foam products from other manufacturers, e.g. 3M "Fireblock Foam Sealant".
So, Great Stuff Fireblock and similar polyurethane foam products should NEVER be installed near any surface that may get hot, e.g. stove vents.
The best option is fireproof sealant, e.g. which is also available from Home Depot. For example: 3M Fire-Barrier Sealant, Model # CP-25WB+ Internet # 100166701 Store SKU # 163096 This product is easy to apply just like any other sealant.
If the gaps between your cabinets and vents are wide, start by packing the gap tightly with fiberglass or Roxul rock wool -- also available from Home Depot. (Roxul rock wool is denser and easier to use.) Then apply a layer of 3M Fire-Barrier sealant.
I hope this is helpful.
Mark Read Less
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February 22, 2015
Answer: 
Yes, it can be used to seal gaps.
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5 answers

Is this product safe for use around non-metallic cable.

This question is from 16 oz. Fireblock Insulating Foam Sealant
Asked by
ky
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September 9, 2014
Can this foam be used around nonmetallic romex cable in a residental environment
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Answers (5)

Asked by
Saint Johns, MI
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Home Improvement Profile: DIYer
July 30, 2015
Answer: 
I'm not a chemical engineer nor am I a polymer scientist, but I've done exactly what you are considering and found that the foam cures and becomes inert the same day it is applied. I have no regrets after using it in this manner and will do so again whenever need arises.
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Home Improvement Profile: DIYer
February 23, 2015
Answer: 
as long as the insulation is not dissolved by acetone or similar base products.
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Asked by
Cleveland,Ohio
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October 10, 2014
Answer: 
yes
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Asked by
Massachusetts
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Home Improvement Profile: DIYer
October 1, 2014
Answer: 
Dear Cowman79: Yes, Dow Great Stuff Fireblock is safe for use around non-metallic cable, with one key caveat: the cured foam ignites at >240 degrees F. This is lower than the ignition temperature for wood studs. Here is a quote from a DOW tech rep: "It is not a firestop or fireproof material. The max-use temperature of the product is 240 degrees F as you stated."
This is true for all of the foam-based Read More
Dear Cowman79: Yes, Dow Great Stuff Fireblock is safe for use around non-metallic cable, with one key caveat: the cured foam ignites at >240 degrees F. This is lower than the ignition temperature for wood studs. Here is a quote from a DOW tech rep: "It is not a firestop or fireproof material. The max-use temperature of the product is 240 degrees F as you stated."
This is true for all of the foam-based "fireblock" and "firestop" products I checked, including Hilti and DAP. Some have even lower ignition temperatures.
So, it should NOT be used near anything that might get hot. When I discovered this surprising issue, I switched to non-flammable fireblocking grout. Home Depot carries a number of good products, e.g. 3M Fire-Block Sealant, Internet # 100390499 Store SKU # 191728 and DAP Fire Stop sealant, Model # 18806 Internet # 100117514.
I hope this is helpful,
Mark Read Less
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September 16, 2014
Answer: 
Hello Cowman79, I’m Chris from the Home Depot’s how-to Community. Thank you for your question.
Yes, this fireblock foam can be used to insulate around NM-B wiring. Watch the video you can find among the product pictures at this page.
I hope this helps,
Chris.
.
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5 answers

What R-value does Great Stuff Fireblock (Model 345372) provide? Can it be used for insulating existing wall cavities?

This question is from 16 oz. Fireblock Insulating Foam Sealant
Asked by
Moderate_Thinker
Minneapolis, MN
July 17, 2013
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Asked by
Aloha OR
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May 28, 2016
Answer: 
Yes the R-value is the same as the other cans of expanding foam and probably depends on the thickness you apply. But guess what?? This product has a combustion temperature of 240 degrees. ....way lower than actual wood does. Why use this when actual fiberglass insulation would work. Or just use regular expanding foam. Dont think because this can is labeled "fireblock" that it could actually resist a Read More
Yes the R-value is the same as the other cans of expanding foam and probably depends on the thickness you apply. But guess what?? This product has a combustion temperature of 240 degrees. ....way lower than actual wood does. Why use this when actual fiberglass insulation would work. Or just use regular expanding foam. Dont think because this can is labeled "fireblock" that it could actually resist a fire. They just hope you dont read the label. Read Less
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Asked by
Boston, MA
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Home Improvement Profile: DIYer
June 13, 2014
Answer: 
Dear Moderate_Thinker: As DOW and Ken noted, Great Stuff Fireblock is not intended for use as insulation, e.g. to insulate existing or new wall cavities. Home Depot sells a range of products that can be used for this purpose, e.g. Roxul rock wool (which is non-flammable), DOW polyiso foam board, and Owens Corning Formular board. We used foam board from Home Depot on a recent remodel job, for example, to Read More
Dear Moderate_Thinker: As DOW and Ken noted, Great Stuff Fireblock is not intended for use as insulation, e.g. to insulate existing or new wall cavities. Home Depot sells a range of products that can be used for this purpose, e.g. Roxul rock wool (which is non-flammable), DOW polyiso foam board, and Owens Corning Formular board. We used foam board from Home Depot on a recent remodel job, for example, to fill all of the stud bays on the interior -- and cover the exterior -- with Great Stuff to fill the cracks, gaps and holes. We also used Roxul to fill the end of joist bays, against the rim joist, and to insulate HVAC pipes in joist bays.
Professionals with high pressure blowers can also fill and pack existing walls with cellulose.
For more information, FineHomebuilding.com offers a great guide. See: www.finehomebuilding.com/how-to/articles/new-insulation-old-walls.aspx
All of this said, Great Stuff is a closed cell polyurethane foam. According to the DOW TDS (Technical Data Sheet), Great Stuff has a K value of .26, which translates to an R value of 3.85 per inch. So Great Stuff is a good solution to seal gaps and fill holes in other insulation, e.g. holes cut in foam board. You could use the standard or "big gap" versions -- the "fireblock" version is not required. If you wet the surface with a spray bottle, this will also significantly increase the volume of the foam -- which will save money. (The water will not affect adhesion.)
I hope this is helpful,
Mark Read Less
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Asked by
Boston, MA
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Home Improvement Profile: DIYer
June 12, 2014
Answer: 
Dear Moderate_Thinker: Great Stuff is a closed-cell polyurethane foam product with an R-value of approximately 3.85 per inch.
An important point: Like all polyurethane foam products, Great Stuff (including the "Fireblock" version) is very flammable. Cured foam will ignite at just 240 degrees F, significantly lower than the ignition temperature of wood. Home Depot sells non-flammable fireblock product, Read More
Dear Moderate_Thinker: Great Stuff is a closed-cell polyurethane foam product with an R-value of approximately 3.85 per inch.
An important point: Like all polyurethane foam products, Great Stuff (including the "Fireblock" version) is very flammable. Cured foam will ignite at just 240 degrees F, significantly lower than the ignition temperature of wood. Home Depot sells non-flammable fireblock product, e.g. 3M and DAP fireblock sealants, that are much better for this purpose.
For insulation, the "Big Gap" version of Great Stuff is a good solution for smaller wall cavities. You can significantly improve the expansion of the foam (and buy fewer cans!) if you dampen the wood surface before you spray it. This improves the foam reaction, and will not affect adhesion. For larger cavities -- including fireblocking required above stud walls and staircases, and vertical fireblocking along stud walls, rock wool is a great solution, e.g. the Roxul product sold by Home Depot. Rock wool is much more dense than fiberglass; you can shape it and it stays put. I stuff Roxul into the ends of every joist bay, up against the rim joist, for example. This provides good insulation and fireblocking.
I hope this is helpful.
Mark Read Less
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August 5, 2013
Answer: 
GREAT STUFF™ Fireblock Insulationg Foam Sealant is a double expanding foam for gaps and cracks 1 inch or less, this product is only made as an air sealant. Dow does not recommend using the GREAT STUFF™ Fireblock to insulate wall cavities. GREAT STUFF™ Fireblock impedes the spread of fire and smoke through service penetrations and is also recognized as an Alternate Fireblocking material for residential Read More
GREAT STUFF™ Fireblock Insulationg Foam Sealant is a double expanding foam for gaps and cracks 1 inch or less, this product is only made as an air sealant. Dow does not recommend using the GREAT STUFF™ Fireblock to insulate wall cavities. GREAT STUFF™ Fireblock impedes the spread of fire and smoke through service penetrations and is also recognized as an Alternate Fireblocking material for residential construction. Read Less
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July 25, 2013
Answer: 
Hi Moderate_Thinker, this product does not have an insulating R value. The manufacture does not recommend using this product in wall cavities. This product is an air sealant, not an insulator.
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4 answers

Can I use this product to insulate my metal stud walls for an exterior Brick oven pizza?

This question is from 16 oz. Fireblock Insulating Foam Sealant
Asked by
Woodstock Vermont
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September 8, 2015
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Answers (4)

Asked by
Boston, MA
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Home Improvement Profile: Professional
May 4, 2016
Answer: 
Dear John:
I definitely hope you have NOT tried to insulate the walls around your brick pizza oven with the product. Although the label on the can says, "Fireblock", this version of Great Stuff is NOT approved as a "fireblock" product and will ignite at just 240 degrees F -- just like all versions of Great Stuff. It is a fire hazard and should not be used near any source of heat or flame.
Home Read More
Dear John:
I definitely hope you have NOT tried to insulate the walls around your brick pizza oven with the product. Although the label on the can says, "Fireblock", this version of Great Stuff is NOT approved as a "fireblock" product and will ignite at just 240 degrees F -- just like all versions of Great Stuff. It is a fire hazard and should not be used near any source of heat or flame.
Home Depot sells other insulation products that are fireproof, with good insulation performance. The best option is Roxul rock wool, which you can stuff into the gaps between your brick oven and the metal stud walls. Roxul is much denser than fiberglass, mold kind of like clay and stays where you put it. The R value is 4 per inch, almost as good as flammable foam board. See: Roxul Comfortbatt Model # RXCB351525, Home Depot Internet # 202090820 Store SKU # 974419
Many Home Depot stores also carry Roxul ComfortBoard -- a 'board like' version that is similar to foamboard, but fireproof. See: Roxul Comfortboard Model # RXCB11224, Home Depot Internet # 206789748 Store SKU # 1001748089
I hope this is helpful.
Mark Read Less
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September 11, 2015
Answer: 
No, this product is not recommended for use around metal stud walls for an exterior Brick oven pizza.
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Asked by
Massachusetts
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September 9, 2015
Answer: 
Dear John: You may be surprised, but the "Fireblock" version of Great Stuff has the same low ignition temperature as all Great Stuff foam products: just 240 degrees F. That is significantly lower than the ignition temperature for wood studs. In other words, Great Stuff will start to burn before wood does!
This is also true for other poly foam products. No version of Great Stuff or other poly foam spray Read More
Dear John: You may be surprised, but the "Fireblock" version of Great Stuff has the same low ignition temperature as all Great Stuff foam products: just 240 degrees F. That is significantly lower than the ignition temperature for wood studs. In other words, Great Stuff will start to burn before wood does!
This is also true for other poly foam products. No version of Great Stuff or other poly foam spray or foam board products should be used near sources of heat, e.g. your brick pizza oven.
Home Depot sells a number of other effective insulation products that are inflammable. The best for your application is Roxul rock wool. It is much denser than fiberglass insulation, can be molded to fit gaps and spaces, and stays where you put it. We've used it to insulate in hot locations and areas that require a firebreak, e.g. the top of walls in a basement and rim joist pockets. Look for:
Roxul Model # RXCB351525 Internet # 205972541
I hope this is helpful.
Mark Read Less
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September 9, 2015
Answer: 
GREAT STUFF (TM) Insulating Foam Sealant products should not be used around heaters, furnaces, fireplaces, or recessed lighting fixtures where it contacts heat conducting surfaces. Cured foam is combustible and may present a fire hazard if exposed to flame or temperatures above 240F.
This product is flammable during dispensing. Do not smoke or use near open flame. Shut off pilot lights and sources of Read More
GREAT STUFF (TM) Insulating Foam Sealant products should not be used around heaters, furnaces, fireplaces, or recessed lighting fixtures where it contacts heat conducting surfaces. Cured foam is combustible and may present a fire hazard if exposed to flame or temperatures above 240F.
This product is flammable during dispensing. Do not smoke or use near open flame. Shut off pilot lights and sources of ignition until tack free.
Can contents are under pressure. Do not place in hot water. Do not puncture, incinerate or store at temperatures over 120F.
The contents of the GREAT STUFF (TM) should be as close to room temperature as possible when dispensed. The application temperature should be from 40°F to 120°F (5°C to 50°C).
GREAT STUFF ™ Fireblock Insulating Foam Sealant is a minimal-expanding, single-component polyurethane foam for general purpose building envelope air sealing. It has led the way in the industry by being the first foam sealant to be recognized as a fireblock. Fireblocking is defined by the International Building Code as the use of approved building materials installed in concealed spaces to resist the migration of fire and hot gases. GREAT STUFF Fireblock is tinted orange to be more recognizable to building code officials.
GREAT STUFF is not approved for use in firestop systems. Read Less
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Customer Reviews

Rated 4.1 out of 5 by 67 reviewers.
Rated 1.0 out of 5.0 by Great stuff This item does not pay you it is a one time use only item they should be on the product somewhere but is it so small you can't read it it should be in leathers large letters July 12, 2016
Rated 5.0 out of 5.0 by I love foam sealant Foam sealant is so easy to use. Just don't overfill and life is good. Worked as expected. July 6, 2016
Rated 3.0 out of 5.0 by Inexpensive This product is very underrated and inexpensive better to buy then the 3m its cheaper and does the same thing July 5, 2016
Rated 4.0 out of 5.0 by Works well Used the product to seal wires coming through the sill. Easy to apply and a very effective seal. Since it does not expand too quickly or too much it was ideal for the use and behind lath, it did not push the lath out of line too much - that was manageable. Only problem that we had was that one can's tube broke off during use and made application a challenge. May 17, 2016
Rated 1.0 out of 5.0 by Never use for fire blocking purposes. how misleading is this? by reading and educating yourself youll see this has an igniting temperature of 240 degrees. regular wood has a higher ignition temperature. Dow Corning is betting on you just thinking it can block all kinds of fire........it says "fire block" on the label so it must be true......WRONG!!! the only thing different about this and their expanding foam is orange dye. this is an approved material to use per building codes if not used to block actual fire. April 19, 2016
Rated 5.0 out of 5.0 by I used this product per the Electrical Inspector in Newington, CT and it sealed the holes needed to be filled excellently. This is a GREAT product.. Product worked exactly the way I wanted it to and it did the job. The only problem was getting off my hands which can only be removed with nail polish remover. March 22, 2016
Rated 5.0 out of 5.0 by Greaaaat Worked exactly how i needed it. Filled the void around my service entry cables. March 15, 2016
Rated 4.0 out of 5.0 by Right can might be my fault kind of cold when used sngle diggets out February 10, 2016
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